Variable gain RF amplifier
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[0025]FIG. 1 illustrates input circuitry of an RF device for receiving an RF signal via an antenna 100. Antenna 100 is coupled to a balun 102, which converts an unbalanced signal into a balanced signal, and in particular the signal from the antenna into a differential signal comprising complementary parts. The differential signal is provided on two lines 103 and 104 to a low noise amplifier (LNA) 106, which amplifies the differential signal. The differential output of LNA 106 is coupled to a variable gain amplifier (VGA) 108, which amplifies the differential signal by a required amount such that the components of the differential output signal RFOUTP and RFOUTN have the required amplitudes. VGA 108 is controlled by a feedback loop.
[0026]Such an arrangement comprising separate circuitry for providing an LNA and a VGA has drawbacks, as discussed in the background section above. In particular, the LNA is likely to comprise at least one transistor for amplifying each part of the differe...
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